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You should be able to get a 3/8" male flare x 1/4" female flare adapter at any Home Depot or Johnstone or wherever. Just make sure you get a 1/4" copper gasket also. Those brass fittings are not designed to make a leak-tight seal against each other without something in between.

"Just Better" makes them...
that is what I used to do it.
looks like harbor freight has them here: http://www.harborfreight.com/38-x-14...ing-68208.html
woah!... wait a minute... Don't you mean 3/8 male x 1/4 female?
Or do you have some other funky way you're doin it?

Though in between the 3/8 line and the core remover, I have those smaller yellowjacket hoses
with the 90 degree shutoff valve for easier flexability in some of those ridiculously tight spaces you have to connect your hoses to.

"Just Better" makes them...
that is what I used to do it.
looks like harbor freight has them here: http://www.harborfreight.com/38-x-14...ing-68208.html
woah!... wait a minute... Don't you mean 3/8 male x 1/4 female?
Or do you have some other funky way you're doin it?

Though in between the 3/8 line and the core remover, I have those smaller yellowjacket hoses
with the 90 degree shutoff valve for easier flexability in some of those ridiculously tight spaces you have to connect your hoses to.

I like your tee setup there, you accomplished basically the same thing as those guys with the exorbitantly priced "vacuum manifold" for probably less than 1/10 the cost. I just put a 1/2" NPT nipple, 1/2" NPT full port ball valve, and a 1/2" male NPT x 1/2" male flare adapter on mine and I adapt it up or down to whatever size hose I'm working with, whether it's 5/8", 1/2", 3/8" or 1/4". Works good for me...